Bob Dylan (born Robert Allen Zimmerman) is an American singer-songwriter, musician, poet and painter. He has been a major figure in music for five decades and has had immense influence on popular music. Much of his most celebrated work dates from the 1960s when he was an informal chronicler and a seemingly reluctant figurehead of social unrest. A number of his early songs such as "Blowin' in the Wind" and "The Times They Are a-Changin'" became anthems for the US civil rights and anti-war movements. Leaving his initial base in the culture of folk music behind, Dylan proceeded to revolutionize perceptions of the limits of popular music in 1965 with the six-minute single "Like a Rolling Stone".